fix(browserFetcher): support macos 10.13 for firefox and chromium

[JoelEinbinder]

I don't have a macos 10.13 build to test on, and we aren't set up to compile it for WebKit. However there is a good chance this will work for Chromium and Firefox.

I also improved the error message received when on an unsupported platform.

#1535

[JoelEinbinder]

@roblav96 can you checkout this patch and see if it works for you on macos 10.13? I'm not set up to test it. Thanks!

[roblav96]

@JoelEinbinder @aslushnikov

Setup

I ended up writing a quick pack_all_packages.sh script that ran npm pack on all packages:

#!/usr/bin/env bash
npm run clean
cd "$HOME/Sandbox/playwright"; npm pack .
cd "$HOME/Sandbox/playwright/packages/playwright-firefox"; npm pack .
cd "$HOME/Sandbox/playwright/packages/playwright-chromium"; npm pack .
cd "$HOME/Sandbox/playwright/packages/playwright"; npm pack .

Then I installed the packed output tar files and node index.js the following test script:

process.nextTick(async () => {
	for (const browserType of ['chromium', 'firefox']) {
		const browser = await require(`playwright-${browserType}`)[browserType].launch()
		const context = await browser.newContext()
		const page = await context.newPage()
		await page.goto('http://whatsmyuseragent.org/')
		await page.screenshot({ path: `example-${browserType}.png` })
		await browser.close()
	}
})

Results

✅ Success

[aslushnikov]

Looks like it does work!

[aslushnikov]

Thank you @roblav96 for testing this! Merging in then.